From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph showing power variation with choke size for a single inlet high power head engine during Bentley single cylinder tests.
| Identifier | ExFiles\Box 134\2\ scan0025 | |
| Date | 23th April 1957 guessed | |
| BENTLEY SINGLE CYLINDER TESTS SHEET 3 V1746 POWER VARIATION WITH CHOKE SIZE (SINGLE INLET HIGH POWER HEAD) HIGH POWER CYL. HEAD TO L C 4075 SINGLE INLET VALVE 1.750 DIA. EXHAUST VALVE 1.500 DIA. COMPRESSION RATIO = 6:1 OPEN EXHAUST FUEL = DTD 224 VALVE TIMING: I.O. 2°E; I.C. 28°L E.O. 51°E; E.C. 7°L Y-Axis (left): BRAKE HORSE POWER X-Axis: R.P.M. Y-Axis (right): B.M.E.P. (LBS/SQ. IN.) Y-Axis (right, lower): SP.{Mr Spinney} FUEL CONSUMPTION (PTS/BHP/HR) 34% CHOKE 36% CHOKE 38% CHOKE APPROX. SP.{Mr Spinney} FUEL CONSUMPTION (COMMON TO ALL CHOKE SIZES) | ||